The Nation­al Insur­ance Crime Bureau says vehi­cle thefts increase in July and August. Most heists are car­ried out by pro­fes­sion­als or mem­bers of orga­nized crime. Many dri­vers leave their car run­ning while unat­tend­ed and do not hide their valu­ables when they park the vehi­cle. Pro­fes­sion­al thieves can steal any­thing, but dri­vers can use a vari­ety of anti-theft devices to make the job more dif­fi­cult.